* Ahmed Mohamed Amey masterminded suicide attacks
* Missile strike took place in southern Somalia
* Al Shabaab poses biggest security threat in E. Africa
By Abdi Sheikh
MOGADISHU, Jan 27 (Reuters) - A U.S. missile strike in southern Somalia on Sunday killed a senior al Shabaab commander who had masterminded suicide attacks by the al Qaeda-linked militant group, two Somali security officials said.
Both intelligence sources and a Somali government spokesman named the target on Monday as Ahmed Mohamed Amey, a chemicals expert also known as Isku Dhuuq.
A U.S. official on Sunday said the missile strike occurred in a remote area near Barawe, a coastal rebel enclave that was the site of a failed raid by American commandos in October targeting a militant known as Ikrima. It was not clear if the missile was launched from a drone.
The security sources said Amey was close to al Shabaab leader Ahmed Abdi Godane, who since taking charge in 2008 has restyled the group as a global player in the al Qaeda franchise - a transformation that was highlighted when it killed at least 67 people in an attack on a Kenyan shopping mall in September.
One of the officials, a former Islamist militant who defected in 2009, said Amey advised Godane on the operations of al Shabaab's Amniyat 'secret service', an elite unit blamed for suicide attacks in the Somali capital, Mogadishu.
"He was a good friend of Godane and the two were always on good terms," said the intelligence official, who identified himself as Hussein. "He was the adviser of al Shabaab leader Godane on matters regarding the Amniyat and masterminding suicide bomb attacks."
The second intelligence source said Amey became an adviser to Godane, who hails from the same Dir clan, after another of the leader's top lieutenants, known as al-Afghani, was killed last year.
A Somali government spokesman described Amey as a "top leader of al Shabaab". A spokesman for the U.S. embassy to Somalia, which is based in the Kenyan capital, could not be reached.
Both Somali intelligence officials said Amey was killed alongside his driver on Sunday.
An offensive by African Union troops has driven al Shabaab from southern Somalia's major towns but the militants still control large rural areas and remain the biggest security threat to east Africa, diplomats and analysts say.
Late last year, the U.S. military deepened its involvement in Somalia, sending a handful of officers to Mogadishu to help advise and support African Union and Somali forces. (Additional reporting and writing by Richard Lough in Nairobi; Editing by Edmund Blair and Mark Trevelyan)